Running back Arian Fosterwon't make the trip to Minnesota for Thursday's preseason finale against the Vikings because he's undergoing treatment for a hamstring injury.

"He came out today and basically did what he did yesterday, stretched with the team, did a little jogging," coach Gary Kubiak said Tuesday. "He'll stay back and rehab. All indications are (he's) heading in the right direction."

Running back Steve Slaton, who has missed the first three preseason games because of a hamstring issue, returned to practice on Tuesday.

"He needs to play, but I've got to go back and see how he did (on tape)," Kubiak said. "I'm not going to put him out there Thursday unless I really know he's ready to go."

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Gary Kubiak has been unhappy that receivers haven't stepped up to earn the fourth and fifth spots.